From ce5c224211a94bfd4c898b51d15febdf2ed9d6f2 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Fri, 26 Aug 2022 11:51:46 +0100
Subject: Refactors some stuff and adds lexing and parsing

---
 main/command.go | 84 ++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 69 insertions(+), 15 deletions(-)

(limited to 'main/command.go')

diff --git a/main/command.go b/main/command.go
index 560d3c3..bad5b1e 100644
--- a/main/command.go
+++ b/main/command.go
@@ -2,24 +2,26 @@ package main
 
 type PrintValueCommand struct {}
 func (cmd PrintValueCommand) exec(state *ProgramState) {
-	state.out <- state.space
+	for _, item := range state.space {
+		state.out <- item
+	}
 }
 
 type ToggleTerminalCommand struct {}
 func (cmd ToggleTerminalCommand) exec(state *ProgramState) {
-	terminal, isTerminal := state.space.value.(TerminalValue)
-	if !isTerminal {
-		return
+	toggled := map[TerminalValue]TerminalValue {
+		ArrayBegin: MapBegin,
+		ArrayEnd: MapEnd,
+		MapBegin: ArrayBegin,
+		MapEnd: ArrayEnd,
 	}
-	switch terminal {
-		case ArrayBegin:
-			state.space.value = MapBegin
-		case ArrayEnd:
-			state.space.value = MapEnd
-		case MapBegin:
-			state.space.value = ArrayBegin
-		case MapEnd:
-			state.space.value = ArrayEnd
+
+	for i := range state.space {
+		terminal, isTerminal := state.space[i].value.(TerminalValue)
+		if !isTerminal {
+			continue
+		}
+		state.space[i].value = toggled[terminal]
 	}
 }
 
@@ -28,11 +30,63 @@ type FilteredCommand struct {
 	command Command
 }
 func (cmd FilteredCommand) exec(state *ProgramState) {
-	if cmd.filter.exec(state) {
-		cmd.command.exec(state)
+	for _, item := range state.space {
+		if cmd.filter.exec(item) {
+			cmd.command.exec(state)
+			return
+		}
+	}
+}
+
+type SequenceCommand struct {
+	commands []Command
+}
+func (cmd SequenceCommand) exec(state *ProgramState) {
+	for _, command := range cmd.commands {
+		command.exec(state)
+	}
+}
+
+type AppendCommand struct {
+	values []WalkValue
+}
+func (cmd AppendCommand) exec(state *ProgramState) {
+	for _, value := range cmd.values {
+		state.space = append(state.space, WalkItem {
+			path: nil,
+			value: value,
+		})
 	}
 }
 
+type PrependCommand struct {
+	values []WalkValue
+}
+func (cmd PrependCommand) exec(state *ProgramState) {
+	var newItems []WalkItem
+	for _, value := range cmd.values {
+		newItems = append(newItems, WalkItem {
+			path: nil,
+			value: value,
+		})
+	}
+	state.space = append(newItems, state.space...)
+}
+
+type PrintLiteralsCommand struct {
+	items []WalkItem
+}
+func (cmd PrintLiteralsCommand) exec(state *ProgramState) {
+	for _, item := range cmd.items {
+		state.out <- item
+	}
+}
+
+type DeleteAllCommand struct {}
+func (cmd DeleteAllCommand) exec(state *ProgramState) {
+	state.space = nil
+}
+
 type Command interface {
 	exec(*ProgramState)
 }
\ No newline at end of file
-- 
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